| http://www.w3.org/ns/prov#value | - The equipment used is a chart which is a map of the sea, it shows how deep the water is where the buoys are and what they look like, the direction and speed of the tidal flow at different times in the tidal cycle, on the coast it shows landmarks, for night time navigation it tells you the colour and flashing sequence of the various navigational lights, for navigation in fog it tells you sequence o
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